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Mood is influenced by immune cells called to the brain in response to stress
Date:8/21/2013

COLUMBUS, Ohio New research shows that in a dynamic mind-body interaction during the interpretation of prolonged stress, cells from the immune system are recruited to the brain and promote symptoms of anxiety.

The findings, in a mouse model, offer a new explanation of how stress can lead to mood disorders and identify a subset of immune cells, called monocytes, that could be targeted by drugs for treatment of mood disorders.

The Ohio State University research also reveals new ways of thinking about the cellular mechanisms behind the effects of stress, identifying two-way communication from the central nervous system to the periphery the rest of the body and back to the central nervous system that ultimately influences behavior.

Unlike an infection, trauma or other problems that attract immune cells to the site of trouble in the body, this recruitment of monocytes that can promote inflammation doesn't damage the brain's tissue but it does lead to symptoms of anxiety.

The research showed that the brain under prolonged stress sends signals out to the bone marrow, calling up monocytes. The cells travel to specific regions of the brain and generate inflammation that causes anxiety-like behavior.

In experiments conducted in mice, the research showed that repeated stress exposure caused the highest concentration of monocytes migrating to the brain. The cells surrounded blood vessels and penetrated brain tissue in several areas linked to fear and anxiety, including the prefrontal cortex, amygdala and hippocampus, and their presence led to anxiety-like behavior in the mice.

"In the absence of tissue damage, we have cells migrating to the brain in response to the region of the brain that is activated by the stressor," said John Sheridan, senior author of the study, professor of oral biology and associate director of Ohio State's Institute for Behavioral Medicine Research (IBMR).

"In this case, the cells
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Contact: John Sheridan
John.Sheridan@osumc.edu
614-293-3571
Ohio State University
Source:Eurekalert

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